JP5332012B2 - Tensile testing machine - Google Patents

Description

  The present invention relates to a tensile testing machine used for an adhesive tape peel test, an interlaminar fracture toughness test for paper, and the like.

  Conventionally, in order to research adhesive tapes and papers, develop products, maintain product quality, prevent quality deterioration, improve quality, etc., peel-off tests for adhesive tapes at the time of research and development and before shipping products For papers, various tensile tests such as an interlaminar fracture toughness test are performed.

  Here, since the adhesive tape is used not only in offices and homes but also in a wide range of fields such as automobiles, architecture, and electronics, there are various adhesive strengths depending on the application. Adhesive tapes are broadly classified into types in which an adhesive is applied to one side of a base material, or types in which the adhesive itself forms a sheet and has adhesive strength on both sides. ) With the expansion of the market, a substrate-less double-sided adhesive tape is also being developed. This baseless double-sided pressure-sensitive adhesive tape has three layers, and the pressure-sensitive adhesive layer is sandwiched between two release films, and there is a difference in the peeling force at the interface between the pressure-sensitive adhesive layer and the release film. Yes.

  The FPD has a multilayer structure in which a plurality of functional films are laminated, and these functional films exhibit various optical characteristics. By the way, in order to apply FPD to a thin television or the like, when bonding functional films to each other, the above-mentioned base-less double-sided adhesive tape is used so that the total thickness becomes thin.

  As a specific operation, first, the release film having the weaker peel force (hereinafter referred to as “light release film”) is peeled off to expose the pressure-sensitive adhesive layer, and is attached to one functional film. Next, the release film on the opposite side (hereinafter referred to as “heavy release film”) is peeled off and attached to another functional film, and two functional films are laminated. By repeating this, the FPD is manufactured.

  By the way, a difference is provided in the peeling force so that peeling operation may be stabilized between the light release film and heavy release film of a base-material-free double-sided adhesive tape. If the peel force difference between the two release films is small, the exposed surface of the pressure-sensitive adhesive layer will be rough, disturbing the light transmission, and cannot be used for optical parts such as FPD, or part of the pressure-sensitive adhesive layer on the light release film In such a case, the adhesive force required for laminating the two functional films may be insufficient and the film may be partially peeled off.

  The peeling force between the release film and the pressure-sensitive adhesive layer varies depending on various conditions. In particular, the peeling speed and the peeling angle are performed under various conditions by processing companies and processing factories, and it is difficult to make them constant from the viewpoint of work efficiency and equipment. If it is not stable, the above troubles may occur.

  Therefore, in the base material-less double-sided pressure-sensitive adhesive tape, it has been necessary to grasp how the peeling force fluctuates in all regions under the conditions employed in the process used.

  As a method for measuring the peel strength of the adhesive tape, a 90 degree peel test (JIS: K6854-1), a 180 degree peel test (JIS: K-6854-2), a T-shaped peel test (JIS: K6854-3), There is a floating roller method peeling test (JIS: K6854-4). In the 90-degree, 180-degree, T-shaped peel test, only the peel force at a predetermined peel angle can be measured. In addition, the 90 degree peel test does not accurately measure the peel force at 90 degrees. With the floating roller method peel test, it is possible to measure the peel force at any peel angle, but it is difficult to always maintain an accurate peel angle, and it is difficult to measure at high peel speeds. .

JIS: K6854-4

  The present invention has been made in order to solve the above-mentioned problems, and the purpose thereof is to accurately measure tensile forces such as various peeling angles and peeling forces in a high-speed region, It is an object of the present invention to provide a tensile tester capable of accurately measuring a tensile force in various tensile states.

In order to achieve the above object, the present invention is a tensile testing machine for performing a tensile test by pulling a part of a test piece by a tensile means to separate the test piece and measuring a tensile load at that time. , A holding means for holding the test piece , provided to be movable along a first axis that is arranged so that a pulling angle with a pulling direction for pulling a part of the test piece by the pulling means is variable. The tension means is provided so as to be movable along a second axis disposed in the tension direction, and rotates in a plane parallel to a plane formed by the first axis and the second axis. A holding part that is provided so as to hold a part of the test piece, and a load measuring part that measures the tensile load, and moves the tensioning means at a predetermined speed along the second axis, In order to keep the tension angle constant, the pulling In synchronism with the movement of the means, characterized in that ingredients and driving means for controlling movement along said holding means to said first axis.

  A plurality of the pulling means may be provided.

  The holding means may include a load measuring unit that measures a tensile load.

You may provide the imaging means which images the isolation | separation part of this test piece at the time of trying to isolate | separate the said test piece.
Further, the drive means can be configured using a shaft motor that is a linear motion motor using magnetic force.

  A tensile testing machine according to the present invention is drivable and includes a holding means for holding a test piece. The tensile means is drivable and can hold a part of the test piece, and a tensile load. And a load measuring unit for measuring the tension means and the holding means so that the angle formed between the test piece held by the holding means and the direction of pulling a part of the test piece (tensile angle) can be varied. The means can be arranged. This makes it possible to accurately perform a tensile test while keeping the tensile angle constant throughout the tensile test, and to measure tensile angles such as various peeling angles and peeling forces at high speeds. There is an effect that it is possible to accurately measure the tensile force in various tensile states.

The schematic diagram seen from the upper surface for demonstrating schematic structure of the tensile testing machine which concerns on 1st Embodiment of this invention. The perspective view for demonstrating the holding means shown in FIG. The perspective view for demonstrating the tension | pulling means shown in FIG. AA sectional drawing of FIG. The schematic diagram seen from the upper surface for demonstrating schematic structure of the tensile testing machine which concerns on 2nd Embodiment of this invention. The figure for demonstrating other embodiment of the test piece used for this invention. The figure for demonstrating the joint structure of a holding means and a tension means.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a schematic view seen from the upper surface for explaining a schematic configuration of the tensile testing machine according to the first embodiment of the present invention, and FIG. 2 is a perspective view for explaining the holding means shown in FIG. 3 is a perspective view for explaining the tension means shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 1, the tensile testing machine 1 according to the first embodiment of the present invention includes a holding means 2 and a tension means 3, and a part of the test piece 4 is pulled by the tension means 3. This is a tensile testing machine that performs a tensile test by separating and measuring the tensile load at that time. In FIG. 1, the holding means 2 and the pulling means 3 are partially omitted. In this embodiment, the test piece 4 is what is called a base-material-less double-sided adhesive tape, and the peeling sheet 42, the adhesive layer 43, and the peeling sheet 41 are laminated | stacked on three layers. The overall control of the tensile testing machine 1 is performed by a control unit such as a personal computer (not shown).

  First, the configuration of the holding means 2 will be described with reference to FIGS. As shown in FIG. 2, the holding means 2 is a means that can be driven and holds the test piece 4. Specifically, the holding means 2 includes a base 21, a shaft motor 22, a mounting base 23, a U-shaped steel material 24, a linear encoder mounting base 25, a linear encoder 26, and a guide rail set 27.

  The base 21 is a base for fixing the shaft motor 22, and mounting bases 23 and 23 are fixed to both ends thereof by screws. In this embodiment, a box-like shape having both ends opened is adopted for easy handling, but the present invention is not limited to this. The mounting base 23 is L-shaped when viewed from the side, and includes a first mounting member 231 provided with a groove at the center of the upper surface and a second mounting tool provided with a groove corresponding to the groove at the center of the lower surface. 232. By screwing in a state where both ends of the shaft 222 of the shaft motor 22 are placed in the grooves of the first fixtures 231 and 231 and the second fixtures 232 and 232 are covered from above, respectively. The shaft motor 22 is attached to the base 21.

  The shaft motor 22 is a linear motion motor having a shape in which a magnet is formed in a cylindrical shape, and includes a slider 221 and a shaft 222. The slider 221 is composed of a coil, while the shaft 222 is composed of a magnet having N poles and S poles joined together, and strong lines of magnetic force are generated from the joints. When an electric current flows through a coil (not shown) constituting the slider 221 that surrounds the shaft 222, a magnetic field is generated, and a thrust is generated according to Fleming's left-hand rule. The thrust causes the slider 221 to move linearly. It is configured. In the shaft motor 22, the slider 221 and the shaft 222 are not in contact with each other and there is no friction. Therefore, the shaft motor 22 is excellent in high speed, constant speed, and positional accuracy. In the present embodiment, the shaft motor is used as the driving means, but other means such as a ball screw may be used.

  As shown in FIG. 4, the detection head 262 of the linear encoder 26 is attached to the slider 221 of the shaft motor 22 via the U-shaped steel material 24 and the linear encoder mounting base 25. Specifically, the U-shaped steel material 24 is laid down, that is, the first vertical plate 241 and the second vertical plate 242 are set horizontally and the horizontal plate 243 is set vertically to surround the slider 221 and The slider 221 is fixed to the H.243 with a screw or the like. On the other hand, with the linear encoder mounting base 25 laid down as shown in FIG. 4, that is, with the long side plate 251 horizontal and the short side plate 252 vertical, a guide rail is provided below the long side plate 251. The guide portion 271 of the set 27 is fixed with screws via the long side plate 251 and the second vertical plate 242, while the detection head 262 of the linear encoder 26 is fixed to the short side plate 252 with screws. At this time, the detection head 262 is arranged above the linear scale 261 and readable.

  The linear encoder 26 includes a linear scale 261 that records magnetic or optically readable position information and a detection head 262 that reads the linear scale 261, and is attached to the base 21. No) Controlled by the control unit. The control unit inputs the signal from the detection head 262 and performs arithmetic processing while moving the detection head 262 relative to the linear scale 261.

  The test piece 4 is held on the horizontal plate 243 of the U-shaped steel material 24 using a double-sided tape or the like. As described above, the U-shaped steel material 24 is attached to the slider 221 that is drivably attached to the shaft 222. As a result, the test piece 4 is held movably with respect to the holding means 2.

  The guide rail set 27 includes a uniaxial guide rail 272 attached to the base 21 and a guide portion 271 slidably attached to the guide rail 272. The slider 221 of the shaft motor 22 is uniaxially (guide rail 271). It is restricted to the reciprocating motion in the direction.

  Next, the configuration of the pulling means 3 will be described with reference to FIG. 3. In this embodiment, since the structure substantially similar to that of the holding means 2 is adopted, only the differences will be described and the same. The same reference numerals are assigned to the configurations of and the detailed description is omitted.

  The difference between the pulling means 3 and the holding means 2 is that, in addition to the configuration of the holding means 2 described above, a holding part 5 that can hold the release sheet 41 and the adhesive layer 43 that are part of the test piece 4, The load cell 6 is a load measuring unit that measures the tensile load, and the bearing unit 7 is configured to rotatably support the load cell 6. These different configurations will be described below.

  The sandwiching portion 5 is a member configured to be able to sandwich the release sheet 41 and the adhesive layer 43 of the base material-less double-sided adhesive tape that is the test piece 4, and includes, for example, a crocodile clip. Further, it may be composed of two plates, and a sandwiched object is sandwiched between the two plates, and the two plates may be opened and closed by a screw or an air cylinder.

  The load cell 6 is a sensor that detects a force (mass, torque), and converts the force cell into an electric signal when the force is applied. In this embodiment, the load cell 6 measures a peeling force, which is one of the tensile loads, and converts it into an electrical signal. Furthermore, any load measuring unit may be used as long as it can convert a tensile load such as a spring alone into a numerical value.

  The bearing portion 7 is a flat rotary plate that employs a bearing, and is attached on the surface of the first vertical plate 241 of the U-shaped steel material 24 and the load cell 6 is rotatably attached to the U-shaped steel material 24. It is a member. Note that the direction of rotation can be both clockwise and counterclockwise. By adopting the bearing section 7, it is possible to quickly eliminate the deviation between the direction in which the tension means is held when moving the load cell 6 at the time of measurement and the traveling direction so as not to cause a measurement error, and it is possible to measure an accurate peeling force. It becomes.

In the first embodiment of the present invention, the holding means 2 configured as described above, the pulling means 3, and the CCD camera 8 which is an imaging means for photographing the peeled portion of the test piece 4 are as shown in FIG. It is preferable to arrange. In this state, the release sheet 41 and the pressure-sensitive adhesive layer 43 of the test piece 4 are clamped together by the clamping unit 5 of the tension means 3. This state is a peeling start state. The angle formed between the holding means 2 and the pulling means 3 can be arbitrarily set by changing the arrangement of the base 21 of the pulling means 3 and the base 21 of the holding means 2. As a result, in the present embodiment, it is possible to carry out a peeling test was arbitrarily set the peel angle theta (angle formed between the X and Y directions in the Z ₁ arrow partially enlarged view of FIG. 1) at the user. The imaging means is not particularly limited as long as it can visually shoot such as a digital video camera.

  The operation will be described with reference to FIG. 1 of the tensile testing machine 1 configured as described above. The base material-less double-sided tape which the adhesive layer 43 has between the peeling sheet 41 and the peeling sheet 42 is prepared, and the test piece 4 which made this a rectangular strip shape is prepared. The release sheet 42 of the test piece 4 is bonded and fixed to the horizontal plate 243 of the shaft motor 22 of the holding means 2 using a double-sided tape or the like. Next, the peeling sheet 41 and the pressure-sensitive adhesive layer 43 at the tip of the test piece 4 on the X direction side are integrally peeled from the peeling sheet 42 by several centimeters, and the peeled release sheet 41 and the pressure-sensitive adhesive layer 43 are sandwiched between the leading ends of the tension means 3. 5 to sandwich. Care is taken that the release sheet 41 and the adhesive layer 43 that have been peeled off do not sag at this time.

  After preparing the test piece 4 in this way, the tension means 3 is adjusted with respect to the holding means 2 so that the peeling angle θ is a desired angle, the shaft motor 22 of the tension means 3 is driven, and the slider 221 is moved to the arrow. Move in Y direction. At the same time, the shaft motor 22 of the holding means 2 is driven to move the slider 221 in the arrow X direction at the same speed. These operation controls are performed in a control unit (not shown) electrically connected to both the holding means 2 and the tension means 3.

  In this embodiment, the sliders 221 of the shaft motors 22 of both the holding means 2 and the tension means 3 are interlocked and moved at the same speed. The interlocking control is performed as follows. That is, the detection head 262 of the linear encoder 26 moves on the linear scale 261 via the U-shaped steel material 24 and the linear encoder mounting base 25 in conjunction with the movement of the slider 221 of the pulling means 3. Then, the control unit detects the position information of the slider 221 of the tension means 3 from the linear encoder 26. If the movement of the slider 221 of the holding means 2 is synchronized based on the detected position information, as a result, the sliders 221 of both the holding means 2 and the tension means 3 can be moved at the same speed.

  In this embodiment, since the peeling test can be performed while moving the sliders 221 of both the holding means 2 and the tension means 3 at the same speed in this manner, the peeling angle θ is kept constant. Moreover, the peeling test can be performed in a fixed point observation state without shifting the peeling point, and unnecessary frictional force is not mixed. As a result, the accuracy of the peel test is improved.

  In this apparatus, since the shaft motor 22 is used as the driving means, it is possible to perform a test at a higher speed than the test conditions of the JIS method, and it is possible to accurately control the peeling angle even at a high speed.

  In the present embodiment, since the CCD camera 8 is configured to capture the peeled state and capture the captured image in the control unit during the peel test, the peeled state during the peel test. Can be stored together with the results of the peel test.

Second Embodiment
The second embodiment of the present invention will be described with reference to FIG. 5, but only the points different from the first embodiment will be described, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted. . Also in FIG. 5, each configuration, that is, holding means 2 </ b> A and tensioning means 3 </ b> A, 3 </ b> B are partially omitted. In the second embodiment as well, the test piece uses a baseless double-sided adhesive tape.

  FIG. 5 is a schematic view seen from the upper surface for explaining a schematic configuration of a tensile testing machine according to the second embodiment of the present invention. The main difference between the tensile testing machine 1A according to the second embodiment and the tensile testing machine 1 is that the holding means is provided with the clamping part 5 and the tensile load when a part of the test piece is pulled by the tensile means. And a point where a load measuring unit for measuring the load is provided, and a plurality of (two in this case) tension means are provided. This will be described in detail below.

  The holding means 2A used in the tensile testing machine 1A according to the second embodiment has the same configuration as the tension means 3 in the first embodiment shown in FIG. Furthermore, the tension means 3A and 3B have the same configuration as the holding means 2A. In this embodiment, the holding means 2A sandwiches one end of the test piece 4, that is, one end of all of the release sheets 41 and 42 and the adhesive layer 43, and the tension means 3A holds the test piece 4 One end of the release sheet 41 which is a part is sandwiched, and one end of the integrated release sheet 42 and the pressure-sensitive adhesive layer 43 which are a part of the test piece 4 is sandwiched by the tension means 3B. This state is shown in FIG.

In the operation, the holding means 2A the direction of arrow X _1, the tensile means 3A the arrow Y ₁ direction, the point of moving in all the same speed tensile means 3B of the arrow Y ₂ direction differs from the first embodiment It is. Also in the operation control, only the control target and the synchronization target are increased by one (the number of pulling means is increased by one), and the other points are the same as in the first embodiment, and thus detailed description thereof is omitted. Also in the second embodiment, the peeling angle (in this case, θ ₁ + θ ₂ , the angle formed by the Y ₁ direction and the Y ₂ direction in the Z ₂ arrow partial enlarged view of FIG. 5) can be arbitrarily set. This is possible, and the same effect as that obtained in the first embodiment can be obtained.
In the second embodiment, not only the angle θ ₁ + θ ₂ formed between the Y ₁ direction and the Y ₂ direction can be arbitrarily set, but also θ ₁ and θ ₂ representing the respective angles around the line extending the test piece. Can be set independently at an arbitrary angle.

  In the above embodiment, the test piece is a baseless double-sided pressure-sensitive adhesive tape, but a peel test and a tensile test are possible even if other test pieces are used. An example is shown in FIGS. 6 (a), (b), and (c). (A) is a double-sided pressure-sensitive adhesive tape having a base material with a test piece as a core, that is, a double-sided pressure-sensitive adhesive tape 4A in which release sheets 41A and 42A, pressure-sensitive adhesive layers 43A and 44A and a base material 45A are laminated as shown in the figure. Yes, in this case, an additional tension means is added to the structure shown in FIG. 5, one end of the double-sided adhesive tape 4A is held by the holding means 2A, and one end of the release sheets 41A, 42A is shown in FIG. Further, the pressure-sensitive adhesive layers 43A and 44A and the base material 45A are integrated, and one end of the pressure-sensitive adhesive layers 43A and 44A and the base material 45A is sandwiched by the additional tension means, and each is moved in the direction indicated by the arrow. Thereby, a peeling test can be performed.

  Moreover, (b) describes a single-sheet paper, and shows the state when an interlaminar fracture toughness test of paper is performed using the tensile tester 1A of the present invention shown in FIG. In this case, by using the tensile testing machine 1A shown in FIG. 5, one end of the paper 4B is held by the holding means 2A, one end of the part 41B of the paper 4B which is broken between layers is pulled, and one end of the tensile means 3A, 42B is pulled by the tensile means. If it is sandwiched by 3B and operated in the direction shown in the drawing as in the second embodiment, the tensile tester of the present invention can be applied to the interlaminar fracture toughness test of paper.

  (C) is a method of attaching an adhesive label 43C in which an adhesive layer 42C is laminated on a surface base material 41C such as paper or film to an adherend 100A (attachment object) selected from a stainless steel plate, a polyethylene plate, cardboard cardboard, and the like. A worn test piece 4C is described, and a state in which an adhesive strength test of the adhesive label 43C is performed using the tensile tester 1 of the present invention shown in FIG. 1 is illustrated. In this case, an operation similar to that shown in FIG. 1 may be performed. However, in this adhesive strength test, the test piece 4C shown in FIG. 6C is used instead of the test piece 4 shown in FIG. 1, and the adherend 100A is placed beside the U-shaped steel material 24 instead of the release sheet 42. A pressure-sensitive adhesive label 43 in which a pressure-sensitive adhesive layer 42 </ b> C is laminated on the surface base material 41 </ b> C instead of the release sheet 41 and the pressure-sensitive adhesive layer 43 is held by the holding unit 5 of the tension means 3. Other points are the same as those in the first embodiment.

  In the first and second embodiments, the holding means and the pulling means are physically separated from each other. However, if a form in which the holding means and the pulling means are jointed is used, the adjustment of the peeling angle is facilitated. . An example of such a joint structure will be described with reference to FIG.

  7A and 7B are views for explaining the joint structure of the holding means and the pulling means. FIG. 7A is a perspective view for explaining the joint structure in the first embodiment, and FIG. 7B is a joint structure of FIG. The top view which expanded the part, (c) And (d) is a figure for demonstrating the joint structure in 2nd Embodiment, (c) is a perspective view, (d) is a top view. Since FIG. 7 is for explaining the joint structure portion, each means is not shown.

  First, the case where the joint structure is applied to the first embodiment will be described with reference to FIGS. 7A and 7B. In FIG. 7A, the holding unit 2 is viewed from the back side. Is shown. When the joint structure is applied to the first embodiment, two mounting plates 210 and 211 are provided on the side plate 21A of the base 21 of the holding means 2. A columnar column 212 is attached between the two mounting plates 210 and 211.

  On the other hand, the tension means 3 has a structure in which a fixing means 32 is provided in the configuration of the tension means 3 shown in FIG. Therefore, here, a fixing means mounting plate 31 for closing the opening h of the tension means 3 shown in FIG. 3 and attaching the fixing means 32 is provided on the opening h side of the tension means 3.

  As shown in FIG. 7B, the fixing means 32 includes an arm 32 </ b> A and an arc-shaped joint portion 32 </ b> B that is provided on one end side of the arm 32 </ b> A and is connected to the support column 212. The diameter of the arc of the joint portion 32B is set according to the diameter of the support column 212.

  7A and 7B show the connection state of the fixing means 32 and the support column 212, and the fixing means 32 is connected to the support column 212 so as to be rotatable in the direction of the arrow.

  Providing such a joint structure improves operability when setting the peel angle.

  Next, with reference to FIGS. 7C and 7D, the case where the joint structure described above is employed in the second embodiment will be described. In this case, the holding means 2A, the tension means 3A, and the tension means 3B are all provided with fixing means 32 as shown in FIGS. 7 (a) and 7 (b). In addition, the magnitude | sizes of the diameter of the joint part 32B of the fixing means 32 are all the same. The method of attaching the fixing means 32 to each means 2A, 3A, 3B is the same as described above. In addition, the height (attachment position from the floor surface) of the three fixing means 32 is set so as not to be the same. Here, in a state where three fixing means 32 are connected to a pole PL which will be described later, the fixing means 32 of the tension means 3B is at the lowest position, the fixing means 32 of the holding means 2A is at the highest position, and the tension means is in the middle. The 3A fixing means 32 is set so as to be positioned. Each fixing means 32 may have a structure that can be raised and lowered.

Furthermore, a cylindrical pole PL having the same diameter as that of the joint portions 32B of all the fixing means 32 is prepared. This pole PL serves as an intermediary tool for connecting the three joint portions 32B. Specifically, the joint portion 32B of the fixing means 32 of each means 2A, 3A, 3B is connected to the pole PL as shown in FIGS. 7 (c) and (d). By adopting such a joint structure, the operability is improved when setting the peel angle as described above.
The joint structure is not limited to the above, and a screw is used instead of the pole PL. In the above, the joint portion 32 has a shape in which a part of the circumference is cut. The fixing means and the pulling means need only be rotatable so that they can be positioned in arbitrary directions.

DESCRIPTION OF SYMBOLS 1, 1A Tensile tester 100A To-be-adhered body 2 Holding means 21 Base 210, 211 Mounting plate 212 Post 22 Shaft motor 221 Slider 222 Shaft 23 Mounting base 231 First mounting tool 232 Second mounting tool 24 U-shaped steel material 241 First 1 vertical plate 242 2nd vertical plate 243 horizontal plate 25 linear encoder mounting base 251 long side plate 252 short side plate 26 linear encoder 261 linear scale 262 detection head 27 guide rail set 271 guide rail 272 guide portion 3 tension means 31 fixed Means mounting plate 32 Fixing means 32A Arm 32B Joint part 4, 4A, 4B, 4C Test piece 41 Release sheet 41C Surface base material 42 Release sheet 43, 42C Adhesive layer 43C Adhesive label 5 Holding part 6 Load cell (load measurement part)
7 Bearing section 8 CCD camera (imaging means)
PL pole

Claims (5)

A tensile testing machine that pulls a part of a test piece by a tensile means and separates the test piece, and performs a tensile test by measuring a tensile load at that time.
A holding means for holding the test piece provided so as to be movable along a first axis arranged so that a pulling angle with a pulling direction for pulling a part of the test piece by the pulling means is variable ; Prepared,
The tension means is
The test piece is provided so as to be movable along a second axis arranged in the pulling direction, and to be rotatable in a plane parallel to a plane formed by the first axis and the second axis. A clamping part for clamping a part;
A load measuring unit for measuring the tensile load;
Have
The pulling means is moved along the first axis in synchronization with the movement of the pulling means so as to move the pulling means along the second axis at a predetermined speed and to keep the pulling angle constant. Driving means for controlling movement
Tensile tester, characterized in that immediately a.   The tensile testing machine according to claim 1, wherein a plurality of the tensile means are provided. The holding means is
The tensile testing machine according to claim 1, further comprising a load measuring unit that measures the tensile load. The tensile testing machine according to any one of claims 1 to 3 , further comprising an imaging unit that images a separated portion of the test piece when the test piece is separated. The tensile testing machine according to any one of claims 1 to 4, wherein the driving means uses a shaft motor that is a linear motion motor using magnetic force.

Images